Fuuun Ishin Dai☆Shogun

In the late Edo period, Japan had experienced an unprecedented crisis by Kurofune (Black Ships), the ships from foreign countries. But a giant robot called Onigami, which has existed since ancient time, dispelled the Kurofune ships and the exclusion of foreigners was accomplished. The story begins in Japan where Meiji restoration in 1868 didn't happen. The tagline says, "I can be the greatest man in the world, because I am a virgin!!" (Source: Crunchyroll)In the late Edo period, Japan faced an unprecedented crisis with the arrival of black ships from overseas. However, Japan drove away the black ships thanks to Onigami, giant robots that have existed in Japan since the ancient times. The country has remained in self-imposed seclusion from foreigners ever since. The story begins in this Japan that never experienced the Meiji Restoration.